Heat over warm water 1 small package chocolate chips together with shortening.,Beat Large eggs with sugar till thick.,Add in flour with baking pwdr and salt.,______,vanilla and blend well.,Add in optional walnuts (minced fine).,Grease 8 x 8 inch pan; cut wax paper to fit, then grease paper.,Pour mix and bake 20 to 25 min at 375 degrees.,Cold and slice.